Version 4.03

Tweaked web page fan command button descriptions and added green background color when fan minimum speed is > 0

Version 4.02

Same as version 4.01 but now the Serial Number displayed on the web page is an integer, not a float, so no ".00" on the end.
Like Ver 4.01 -has USB prompt for WiFi SSID, password and hostname during boot up. If nothing entered, boot continues with
values saved in EEPROM.

Version 4.01

This version uses the USB Serial port to prompt for new WiFi SSID, then password, then Host Name.

Host name access only works sometimes for my home LAN. You may need to reserved the IP in your LAN DHCP so it doesn't change
and just use the IP address to access the web server.

There's a 12-second countdown once the serial port is plugged in and the board powers up,
Followed by a 10-second window to start entering a new WiFi SSID.
If there is a new entry, the data is stored in EEPROM and the board reboots.
If there's no entry within 10 seconds, the boot-up continues, loading the existing infor off the EEPROM.

I had luck using the Serial port built into the Arduino programming tool, but PUTTY won't seem to work right. Not sure why.
Follow the prompts. The serial USB port is 115,200 baud 8,N,1.

Version 3.05

Found serial port timing issues with earlier release. Added delays and tweaked polling of AMP via serial shell. Seems stable. Enjoy the bright blue LED showing AMP serial port communication (slows down to 1 second poll when amp is powered off).

Version 3.03

Cosmetic changed to the web page. Added IP on home page + move temp and fan control onto same line on PX page.

Version 3.01

Added hostname feature "kpa500" - if it works can access server via URL: http://kpa500.local

Sometimes works for me on my LAN, sometimes doesn't

Also added serial port power pin output with delay. Optional, but if powering RS-232 adapter off pin, then may eliminate startup garbage .
Serial startup garbage of a "D" puts amp in download mode. This may eliminate that issue.

Version 2.19

Cosmetic changes to web page -move band to top - have band and mode now all show dark grey on power off

Version 2.18

Adds brown/red color coding to temp display. Brown > 120, red > 150 'F

Version 2.17

Changed timing on serial port - commented out messages no longer needed for debugging.
... hoping to improve webserver<>amp serial port communication to make it more reliable

Version 2.16

Added WiFi signal strength and WiFi SSID to web page - more tweaks to web page